Method for shaping a metal diaphragm of a pressure flange, pressure flange

Abstract

The application provides a method for shaping a pressure measuring flange metal diaphragm, and a pressure measuring flange, and belongs to the technical field of pressure measuring flanges, and can at least partially solve the problem that the metal diaphragm of an existing pressure measuring flange is prone to bulging at a sealing surface. The method for shaping a pressure measuring flange metal diaphragm comprises the following steps: providing a pressure measuring flange, a flexible film and a shaping clamp; the pressure measuring flange comprises a flange seat and a metal diaphragm, the flange seat has a sealing surface, the sealing surface is provided with a recessed accommodating structure, and the metal diaphragm is located outside the sealing surface; the flexible film is composed of a flexible material; the shaping clamp is provided with a shaping surface matched with the sealing surface; the flexible film is arranged between the metal diaphragm and the shaping surface; and the sealing surface and the shaping surface are moved close to each other, so that a force directed to the sealing surface is applied to the metal diaphragm, plastic deformation of the metal diaphragm occurs, and the metal diaphragm partially enters the accommodating structure.

Description

Technical Field

[0001] This invention belongs to the field of pressure testing flange technology, specifically relating to a method for shaping a metal diaphragm of a pressure testing flange and a pressure testing flange. Background Technology

[0002] In pressure transmitters, the pressure sensing flange is one of the key components for achieving pressure detection.

[0003] The sealing surface of the flange seat of the pressure testing flange is equipped with a metal diaphragm. However, the metal diaphragm at this location is prone to bulging, which may cause users to suspect that the product has poor sealing and affect the user experience. Summary of the Invention

[0004] This invention at least partially solves the problem that the metal diaphragm of the existing pressure measuring flange is prone to bulging at the sealing surface, and provides a method for shaping the metal diaphragm of the pressure measuring flange and a pressure measuring flange.

[0005] In a first aspect, embodiments of the present invention provide a method for shaping a metal diaphragm of a pressure-measuring flange, comprising:

[0006] A pressure testing flange, a flexible diaphragm, and a shaping fixture are provided. The pressure testing flange includes a flange seat and a metal diaphragm. The flange seat has a sealing surface with a recessed receiving structure formed on the sealing surface. The metal diaphragm is located outside the sealing surface. The flexible diaphragm is made of a flexible material. The shaping fixture has a shaping surface that matches the sealing surface.

[0007] The flexible membrane is disposed between the metal diaphragm and the shaping surface; and

[0008] The sealing surface and the shaping surface are brought close together to apply a force to the metal diaphragm pointing towards the sealing surface, causing the metal diaphragm to undergo plastic deformation and partially enter the receiving structure.

[0009] Optionally, the ratio of the depth of the receiving structure to the thickness of the metal diaphragm is (1.8 to 2.5):1.

[0010] Optionally, the sealing surface is an annular surface surrounding the pressure measuring area; and

[0011] The accommodating structure includes multiple annular grooves arranged around the pressure measuring area.

[0012] Optionally, the cross-section of each of the annular grooves is arc-shaped or trapezoidal.

[0013] Optionally, the cross-section of each of the annular grooves is arc-shaped;

[0014] The distance between the centerlines of any two adjacent annular grooves is between 0.6 mm and 1.2 mm;

[0015] The depth of the annular groove is between 0.18 mm and 0.25 mm; and

[0016] The radius of the arc shape of the cross-section of the annular groove is between 0.4 mm and 0.6 mm.

[0017] Optionally, the ratio of the thickness of the flexible membrane to the depth of the accommodating structure is (0.9 to 1.5):1.

[0018] Optionally, the density of the flexible membrane material is 950 kg / m³. 3 ~1500Kg / m 3 ;

[0019] The material of the flexible membrane has a Poisson's ratio of 0.35 to 0.45;

[0020] The tensile strength of the flexible membrane material is between 150 MPa and 300 MPa.

[0021] The elongation at break of the flexible membrane material is between 80% and 300%; and

[0022] The elastic modulus of the material of the flexible membrane is between 700 MPa and 1000 MPa.

[0023] Optionally, the material of the flexible membrane includes at least one of polyethylene and polytetrafluoroethylene.

[0024] Optionally, bringing the sealing surface and the shaping surface closer together includes:

[0025] The sealing surface and the shaping surface are brought close to each other at a speed of 0.5 mm / s to 10 mm / s until the pressure between the sealing surface and the shaping surface reaches 30 MPa to 90 MPa.

[0026] Optionally, the step of disposing the flexible membrane between the metal diaphragm and the shaping surface includes: setting the shaping fixture with the shaping surface facing upwards; placing the flexible membrane on the shaping surface; placing the pressure measuring flange on the flexible membrane with the metal diaphragm facing downwards, so that the sealing surface corresponds to the shaping surface; and

[0027] The step of bringing the sealing surface and the shaping surface closer together includes applying a downward force to the side of the pressure measuring flange away from the metal diaphragm, so that the sealing surface and the shaping surface approach each other.

[0028] Optionally, the shaping fixture includes a first portion and a second portion; the first portion has a first mating surface, and the shaping surface is located on the side of the first portion opposite to the first mating surface; the second portion has a second mating surface that matches the first mating surface; one of the first mating surface and the second mating surface is a convex spherical cap surface, and the other is a concave spherical cap surface; and

[0029] The step of setting the shaping fixture with the shaping surface facing upward includes: setting the second part with the second mating surface facing upward; and setting the first part on the second part with the shaping surface facing upward, so that the first mating surface and the second mating surface mate.

[0030] Optionally, the ratio of the maximum outer diameter of the shaping surface to the maximum outer diameter of the sealing surface is (1.05~2)∶1; and

[0031] The diameter of the convex spherical crown is between 200 mm and 600 mm.

[0032] Optionally, the metal diaphragm is a tantalum diaphragm.

[0033] Optionally, the sealing surface is an annular surface surrounding the pressure testing area; the pressure testing flange includes:

[0034] Flange seats are available;

[0035] The metal diaphragm is disposed outside the sealing surface;

[0036] The metal diaphragm is welded to the outer edge of the pressure measuring area using a first welding process; and

[0037] The metal diaphragm is welded to the outer edge of the sealing surface using a second welding process.

[0038] Optionally, the first welding process is roll resistance welding; and

[0039] The second welding process is tungsten inert gas welding.

[0040] Optionally, between providing the flange seat and disposing the metal diaphragm outside the sealing surface, the method further includes:

[0041] The receiving structure is formed by machining on the sealing surface.

[0042] In a second aspect, embodiments of the present invention provide a method for shaping a metal diaphragm of a pressure-measuring flange, comprising:

[0043] A pressure-testing flange, a flexible diaphragm, and a shaping fixture are provided. The pressure-testing flange includes a flange seat and a metal diaphragm. The flange seat has a sealing surface with a recessed receiving structure formed on the sealing surface. The metal diaphragm is located outside the sealing surface. The flexible diaphragm is made of a flexible material. The shaping fixture has a shaping surface that matches the sealing surface. The shaping fixture includes a first part and a second part. The first part has a first mating surface, and the shaping surface is located on the side of the first part opposite to the first mating surface. The second part has a second mating surface that matches the first mating surface. One of the first mating surface and the second mating surface is a convex spherical crown surface, and the other is a concave spherical crown surface.

[0044] The second part is positioned with the second mating surface facing upwards;

[0045] The first part is disposed on the second part with the shaping surface facing upward, so that the first mating surface and the second mating surface mate;

[0046] The flexible membrane is disposed on the shaping surface;

[0047] The pressure-measuring flange is positioned on the flexible diaphragm with the metal diaphragm facing downwards, so that the sealing surface corresponds to the shaping surface; and

[0048] A downward force is applied to the side of the pressure measuring flange away from the metal diaphragm, so that the sealing surface and the shaping surface approach each other, thereby applying a force to the metal diaphragm pointing towards the sealing surface, causing the metal diaphragm to undergo plastic deformation and partially enter the receiving structure.

[0049] Optionally, the metal diaphragm is a tantalum diaphragm;

[0050] The flexible membrane is made of polyethylene;

[0051] The sealing surface is an annular surface surrounding the pressure measuring area; and

[0052] The tantalum diaphragm is connected to the outer edge of the pressure measuring area by roll resistance welding, and the tantalum diaphragm is connected to the outer edge of the sealing surface by tungsten inert gas welding.

[0053] Thirdly, embodiments of the present invention provide a pressure-measuring flange, which includes:

[0054] A flange seat having a sealing surface, wherein a recessed receiving structure is formed on the sealing surface; and,

[0055] A metal diaphragm is disposed outside the sealing surface, and part of the material of the metal diaphragm enters the receiving structure through plastic deformation.

[0056] Optionally, the metal diaphragm is a tantalum diaphragm;

[0057] The sealing surface is an annular surface surrounding the pressure measuring area; and

[0058] The tantalum diaphragm is connected to the outer edge of the pressure measuring area by roll resistance welding, and the tantalum diaphragm is connected to the outer edge of the sealing surface by tungsten inert gas welding.

[0059] In this embodiment of the invention, by setting up a receiving structure and using a flexible membrane, a portion of the metal diaphragm material can be fully "pressed" into the receiving structure during the shaping process, ensuring that no other damage occurs during the shaping process. As a result, in the shaped pressure testing flange, the metal diaphragm will be tightly bonded to the sealing surface of the flange seat, eliminating defects such as bulges and wrinkles, thereby improving the quality of the pressure testing flange, eliminating user concerns, and improving the user experience. Attached Figure Description

[0060] Figure 1 This is a cross-sectional structural diagram of a pressure-measuring flange used in some related technologies;

[0061] Figure 2 This is a top view of the flange seat of a pressure measuring flange in some related technologies;

[0062] Figure 3 This is a cross-sectional structural diagram of the flange seat of a pressure measuring flange in some related technologies;

[0063] Figure 4 These are photographs of bulging metal diaphragms in pressure testing flanges used in some related technologies.

[0064] Figure 5 This is a schematic flowchart of a method for shaping a pressure-measuring flange metal diaphragm according to an embodiment of the present invention;

[0065] Figure 6 This is a top view of the flange seat used in a method for shaping a pressure-measuring flange diaphragm according to an embodiment of the present invention.

[0066] Figure 7 This is a cross-sectional view of the flange seat used in a method for shaping a pressure-measuring flange diaphragm according to an embodiment of the present invention.

[0067] Figure 8 This is a partially enlarged cross-sectional view of the flange seat used in a method for shaping a pressure-measuring flange diaphragm according to an embodiment of the present invention.

[0068] Figure 9 This is a partially enlarged cross-sectional view of the flange seat used in another method for shaping a pressure-measuring flange diaphragm according to an embodiment of the present invention.

[0069] Figure 10This is a cross-sectional view of the structure before the pressing begins in a method for shaping a pressure-measuring flange metal diaphragm according to an embodiment of the present invention.

[0070] Figure 11 This is a cross-sectional structural diagram of the pressing process in a method for shaping a pressure-measuring flange metal diaphragm according to an embodiment of the present invention.

[0071] Figure 12 This is a partially enlarged cross-sectional view of the pressing structure of a method for shaping a pressure-measuring flange metal diaphragm according to an embodiment of the present invention.

[0072] Figure 13 This is a cross-sectional view of a pressure-measuring flange obtained by a method for shaping a metal diaphragm of a pressure-measuring flange according to an embodiment of the present invention.

[0073] Figure 14 This is a cross-sectional view of the structure before pressing begins in another method for shaping the metal diaphragm of a pressure-measuring flange according to an embodiment of the present invention.

[0074] Figure 15 This is a photograph of a pressure-measuring flange obtained by a method for shaping a metal diaphragm of a pressure-measuring flange according to an embodiment of the present invention.

[0075] Figure 16 A photograph of the pressure testing flange obtained by shaping when using a flange seat without a housing structure;

[0076] Figure 17 A photograph of the pressure testing flange obtained by shaping without using a flexible diaphragm;

[0077] Figure 18 This is a flowchart illustrating another method for shaping a pressure-measuring flange diaphragm according to an embodiment of the present invention.

[0078] The meanings of some of the reference numerals in the attached figures are as follows:

[0079] 1. Flange seat; 11. Sealing surface; 119. Receiving structure; 12. Pressure measuring area; 121. Pressure measuring hole; 111. Positioning groove; 2. Metal diaphragm; 21. Pressure measuring structure; 3. Flexible diaphragm; 4. Shaping fixture; 41. First part; 42. Second part; 491. Shaping surface; 492. Slot; 51. Worktable; 52. Pressure head. Detailed Implementation

[0080] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0081] It is understood that the specific embodiments and accompanying drawings described herein are merely for explaining the invention and are not intended to limit the invention.

[0082] It is understood that, without conflict, the various embodiments of the present invention and the features thereof can be combined with each other.

[0083] It is understood that, for ease of description, the accompanying drawings of this invention only show the parts related to the embodiments of this invention, while the parts unrelated to the embodiments of this invention are not shown in the drawings.

[0084] It is understood that, without conflict, the functions and steps marked in the flowcharts and block diagrams of the embodiments of the present invention may occur in a different order than that marked in the accompanying drawings.

[0085] In some related technologies, a pressure sensing flange can be installed in the pressure transmitter to realize the pressure detection of the fluid (such as liquid) to be measured.

[0086] Reference Figure 1 The pressure testing flange may include a flange seat 1 and a metal diaphragm 2 (such as a tantalum diaphragm with a thickness of 0.1 mm).

[0087] Reference Figures 1 to 3 The flange seat 1 has an annular (such as a circular) sealing surface 11 on one side. The sealing surface 11 is divided into a pressure measuring area 12 by the dotted line in the figure. The surface of the pressure measuring area 12 is provided with a pressure measuring hole 121 that communicates with the fluid to be measured (such as the fluid located on the other side of the flange seat 1).

[0088] Reference Figure 1 The metal diaphragm 2 is located outside the side of the flange seat 1 with the sealing surface 11, and the portion of the metal diaphragm 2 corresponding to the pressure measuring area 12 may be provided with a pressure measuring structure 21. For example, referring to... Figure 1 The pressure measuring structure 21 of the metal diaphragm 2 can be in the form of a pressure measuring corrugated surface, and the center of the pressure measuring area 12 of the flange seat 1 can be slightly recessed to avoid contact with the pressure measuring corrugated surface. The recessed part of the metal diaphragm 2 corresponding to the pressure measuring area 12 can also be slightly recessed to avoid the pressure measuring corrugated surface protruding relative to the overall surface of the pressure measuring flange.

[0089] Reference Figure 1 The position of the metal diaphragm 2 corresponding to the outer edge of the pressure measuring area 12 (e.g.) Figure 1The flange diaphragm 2 is welded (e.g., by resistance welding) to the flange seat 1 at the position indicated by the dotted line in the diagram. Outside the welded position, the surface of the flange seat 1 (sealing surface 11) may also have a positioning groove 111 (the metal diaphragm 2 may have a bent structure that can be inserted into the positioning groove 111). Thus, a relatively closed pressure measuring space (the space between the recessed area of ​​the pressure measuring area 12 and the recessed area of ​​the metal diaphragm 2) communicating with the pressure measuring hole 121 can be formed inside the welded structure. Therefore, when the fluid pressure connected to the pressure measuring hole 121 changes, the pressure in the pressure measuring space also changes accordingly, causing the pressure measuring structure 21 of the metal diaphragm 2 to deform. Furthermore, by detecting the deformation of the pressure measuring structure 21, the fluid pressure can be determined, thus achieving pressure detection.

[0090] At the same time, refer to Figure 1 The position of the metal diaphragm 2 corresponding to the outer edge of the sealing surface 11 ( Figure 1 The metal diaphragm 2 on the upper end of the left and right "sides" of the flange seat 1 can also be welded to the flange seat 1 (such as tungsten inert gas welding).

[0091] However, refer to Figure 1 , Figure 4 The metal diaphragm 2 at the corresponding sealing surface 11 is prone to bulging (e.g. Figure 1 , Figure 4 (As shown in the circle in the image), and users are likely to suspect that the bulge is caused by poor sealing of the pressure measurement space, thus believing that the product is unqualified and affecting the user experience.

[0092] The causes of bulging may be as follows (but it should be understood that the following is not a limitation on the causes of bulging): When the inner side of the metal diaphragm 2 (corresponding to the outer edge of the pressure measuring area 12) is welded to the flange seat 1, the metal diaphragm 2 deforms due to pressure and heat, resulting in slight wrinkles on the metal diaphragm 2 at the sealing surface 11; when the outer side of the metal diaphragm 2 (corresponding to the outer edge of the sealing surface 11) is welded to the flange seat 1, the metal diaphragm 2 deforms again due to heat, etc., and since the inner side of the metal diaphragm 2 has been welded and fixed at this time, the above deformation cannot be released and can only accumulate at the position of the sealing surface 11, resulting in obvious bulging of the metal diaphragm 2 at the sealing surface 11.

[0093] Firstly, referring to Figures 5 to 17 This invention provides a method for shaping a pressure-measuring flange metal diaphragm 2.

[0094] The method of this invention is used to shape the metal diaphragm 2 at the position corresponding to the sealing surface 11 in the pressure testing flange, so as to eliminate defects such as bulges that may exist therein.

[0095] However, it should be understood that the application scope of the method of the present invention is not limited to the case where the metal diaphragm 2 at the position corresponding to the sealing surface 11 has a bulge, but can be used to reshape any pressure testing flange (such as a pressure testing flange where the metal diaphragm 2 does not have obvious defects).

[0096] Reference Figure 5 The method for shaping the pressure-measuring flange metal diaphragm 2 according to an embodiment of the present invention includes:

[0097] S101, provides pressure testing flange, flexible diaphragm 3, and shaping fixture 4.

[0098] Among them, reference Figure 10 The pressure testing flange includes a flange seat 1 and a metal diaphragm 2. The flange seat 1 has a sealing surface 11, on which a recessed receiving structure 119 is formed. The metal diaphragm 2 is located outside the sealing surface 11.

[0099] Among them, the flexible membrane 3 is made of flexible material.

[0100] The shaping fixture 4 has a shaping surface 491 that matches the sealing surface 11.

[0101] In this embodiment of the invention, a pressure testing flange product to be shaped is first provided, as well as a flexible diaphragm 3 and a shaping fixture 4 used in the shaping process.

[0102] Reference Figure 10 The pressure testing flange of this embodiment may also include a flange seat 1 and a metal diaphragm 2 (such as a tantalum diaphragm with a thickness of 0.1 mm), and the metal diaphragm 2 may be located at least outside the sealing surface 11 of the flange seat 1.

[0103] Reference Figures 6 to 9 In this embodiment of the invention, the flange seat 1 is further provided with a receiving structure 119 that is recessed downward relative to the plane where the sealing surface 11 is located (such as pre-processed), for example, in the form of a groove or pit.

[0104] It should be understood, with reference Figure 6 , Figure 7 In the flange seat 1 of this embodiment, the sealing surface 11 may also be annular (such as circular), and its inner edge may also be provided with a positioning groove 111. The inner side of the sealing surface 11 may also be a pressure measuring area 12, and the pressure measuring area 12 may also be provided with a pressure measuring hole 121. The center position of the pressure measuring area 12 may also be slightly recessed, etc. These known structures will not be described in detail here.

[0105] In contrast, refer to Figure 10In this embodiment of the invention, the metal diaphragm 2 can also cover the pressure measuring area 12, and a pressure measuring structure 21 (such as a pressure measuring corrugated surface) can also be provided at the position corresponding to the pressure measuring area 12. The metal diaphragm 2 can also be provided with a bending structure that can be inserted into the positioning groove 111. In addition, the recessed part of the metal diaphragm 2 corresponding to the pressure measuring area 12 can also be slightly recessed. These known structures will not be described in detail here.

[0106] In this embodiment of the invention, reference is made to Figure 11 The shaping fixture 4 has a shaping surface 491 corresponding to the sealing surface 11, that is, the sealing surface 11 can be "pressed" onto at least a portion of the sealing surface 11.

[0107] It should be understood that the structure of the shaping fixture 4 should ensure that its shaping surface 491 can press against the sealing surface 11, for example, referring to Figure 10 The shaping surface 491 of the shaping fixture 4 can be an annular shape corresponding to the sealing surface 11, and the shaping surface 491 can have at least a slot 492 corresponding to the pressure measuring area 12, for reference. Figure 11 When the shaping surface 491 is pressed onto the sealing surface 11, the slot 492 can "avoid" the pressure measuring structure 21 in the metal diaphragm 2, so as to avoid applying pressure to the pressure measuring structure 21 and causing it to deform.

[0108] In this embodiment of the invention, the flexible membrane 3 is a thin film made of a material that is "softer" than the pressure measuring flange, the shaping clamp 4, the metal diaphragm 2, etc., such as a polymer material film.

[0109] S102. The flexible membrane 3 is placed between the metal membrane 2 and the shaping surface 491.

[0110] Reference Figure 10 According to an embodiment of the present invention, the above-mentioned flexible membrane 3 can be disposed at least between the metal diaphragm 2 of the pressure measuring flange and the shaping surface 491 of the shaping fixture 4 (that is, the flange seat 1, the metal diaphragm 2, the flexible membrane 3, and the shaping fixture 4 can be arranged sequentially in the same direction), and the shaping surface 491 of the shaping fixture 4 is located at the position of the corresponding sealing surface 11 (with the flexible membrane 3 in between).

[0111] S103. The sealing surface 11 and the shaping surface 491 are brought close to each other to apply a force to the metal diaphragm 2 pointing towards the sealing surface 11, so that the metal diaphragm 2 undergoes plastic deformation and partially enters the receiving structure 119.

[0112] Reference Figure 11 This causes the pressure testing flange and the shaping fixture 4 to gradually approach each other, thereby causing the shaping surface 491 of the shaping fixture 4 to gradually "press" against the sealing surface 11 of the flange seat 1. In other words, the shaping surface 491 applies pressure to the metal diaphragm 2 at the position corresponding to the sealing surface 11 with the flexible membrane 3 as the "intermediary", and this pressure is directed (e.g., in a direction perpendicular to the sealing surface 11) towards the sealing surface 11.

[0113] Therefore, during the pressing process, refer to Figure 12 The metal diaphragm 2 undergoes permanent plastic deformation under pressure, with some of its material being "pressed" into the recess of the receiving structure 119. This allows for the removal of the reference material after the shaping fixture 4 and the flexible diaphragm 3 are separated. Figure 13 The pressure testing flange, that is, part of the material of the metal diaphragm 2 corresponding to the sealing surface 11 is pressed into the receiving structure 119, so that the metal diaphragm 2 is tightly connected to the sealing surface 11.

[0114] The pressure testing flange shaped using the method of this embodiment can be referred to Figure 15 As can be seen, the metal diaphragm 2 at the sealing surface 11 is tightly attached to the sealing surface 11, and the outer surface of the metal diaphragm 2 may have a depression corresponding to the receiving structure 119, but there are no defects such as bulges.

[0115] Conversely, if there is no accommodating structure on the sealing surface 11, the pressure testing flange obtained after shaping can be referenced. Figure 16 It is evident that during this pressing process, since the "excess" material at the bulges in the metal diaphragm 2 cannot simply disappear or have any place to be accommodated, a large number of protrusions and wrinkles still remain on the metal diaphragm 2 after the shaping fixture 4 is removed (e.g., Figure 16 As shown in the circle in the image, the defects of the metal diaphragm 2 cannot be effectively eliminated.

[0116] In contrast, refer to Figure 12 When the receiving structure 119 is present, the excess material in the metal diaphragm 2 can be "pressed" into the receiving structure 119, thereby completely eliminating the bulge.

[0117] Since the shaping fixture 4, flange seat 1, and metal diaphragm 2 are all rigid structures with high hardness, if the metal diaphragm 2 at the corresponding receiving structure 119 is to be fully "pressed" into the receiving structure 119, the sealing surface 11 and the metal diaphragm 2 at the gap of the receiving structure 119 are easily damaged due to excessive force. For example, if a flexible diaphragm is not used for direct pressing, the pressure measuring flange obtained after shaping can be referenced. Figure 17 As can be seen, the surface of the metal diaphragm 2 has a large number of scratches and ripples (such as...). Figure 17 (As shown in the circle in the image), this demonstrates that such a reshaping process introduces new defects.

[0118] In contrast, refer to Figure 12When using the flexible membrane 3, the flexible membrane 3 can play a "buffering" role. While ensuring that the metal diaphragm 2 at the corresponding receiving structure 119 is fully pressed into the receiving structure 119, it also avoids damage to the sealing surface 11 and the metal diaphragm 2 at the gap of the corresponding receiving structure 119 due to excessive force. This ensures that the metal diaphragm 2 can be deformed into a shape that basically "corresponds" to the receiving structure 119, so that it is tightly combined with the sealing surface 11.

[0119] In this embodiment of the invention, by setting the receiving structure 119 and using the flexible membrane 3, a portion of the material of the metal diaphragm 2 can be fully "pressed" into the receiving structure 119 during the shaping process, and it is ensured that no other damage will occur during the shaping process. As a result, in the shaped pressure testing flange, the metal diaphragm 2 will be tightly bonded to the sealing surface 11 of the flange seat 1, and there will be no defects such as bulges or wrinkles, thereby improving the quality of the pressure testing flange, eliminating user concerns, and improving the user experience.

[0120] It should be understood that the above shaping methods can be implemented using shaping equipment (such as a press). Among them, the pressure measuring flange is the object of shaping and needs to be replaced each time shaping is performed; the shaping fixture 4 can be reused as part of the shaping equipment; and the flexible membrane 3 usually develops indentations and other deformations after each use, so it can be replaced as a consumable material used in shaping each time.

[0121] Optionally, the metal diaphragm 2 is a tantalum diaphragm.

[0122] As one embodiment of the present invention, the metal diaphragm 2 may be made of tantalum (Ta).

[0123] Optional, refer to Figure 6 The sealing surface 11 is an annular surface surrounding the pressure testing area 12; the pressure testing flange (S101) includes:

[0124] S1011, Provide flange seat 1.

[0125] S1012. Place the metal diaphragm 2 outside the sealing surface 11.

[0126] S1013. The metal diaphragm 2 is welded to the outer edge of the pressure measuring area 12 through the first welding process.

[0127] S1014. The metal diaphragm 2 is welded to the outer edge of the sealing surface 11 through the second welding process.

[0128] As one embodiment of the present invention, refer to Figure 10 Alternatively, the metal diaphragm 2 can be positioned outside the side of the flange seat 1 with the sealing surface 11 (and the bent structure of the metal diaphragm 2 can be inserted into the positioning groove 111 of the flange seat 1), and the metal diaphragm 2 can be sequentially positioned at the outer edge of the pressure measuring area 12 (e.g., Figure 10The dotted line position in the image), and the corresponding outer edge of the sealing surface 11 (such as... Figure 10 The upper ends of the left and right sides of the middle flange seat 1 are welded to the flange seat 1 to obtain the pressure measuring flange to be shaped.

[0129] Optionally, the first welding process is resistance rolling welding; and the second welding process is tungsten inert gas welding.

[0130] As one embodiment of the present invention, the welding of the metal diaphragm 2 to the outer edge of the pressure measuring area 12 can be carried out by rolling resistance welding, while the welding of the metal diaphragm 2 to the outer edge of the sealing surface 11 can be carried out by tungsten inert gas welding (TIG).

[0131] When the tantalum diaphragm is connected to the flange seat 1 using the above welding process, bulging defects are more likely to occur. Therefore, it is suitable to use the method of the embodiment of the present invention for shaping.

[0132] However, it should be understood that the application scope of the shaping method of the present invention is not limited to tantalum films, nor is it limited to the welding process described above.

[0133] Optionally, between providing the flange seat 1 (S1011) and disposing the metal diaphragm 2 outside the sealing surface 11 (S1012), the method further includes:

[0134] S10111, A receiving structure 119 is formed on the sealing surface 11.

[0135] As one embodiment of the present invention, the flange seat 1 provided may be without a receiving structure, so that before welding the metal diaphragm 2, it can also be referred to Figure 6 First, the above-mentioned receiving structure 119 is pre-processed (e.g., machined) on the sealing surface 11 of the flange seat 1.

[0136] It should be understood that if the flange seat 1 provided in the embodiment of the present invention has a pre-formed receiving structure 119 on the sealing surface 11, or if a pressure measuring flange with a receiving structure 119 and a welded metal diaphragm 2 is directly provided, it is feasible.

[0137] Optional, refer to Figure 8 The ratio of the depth of the accommodating structure 119 to the thickness of the metal diaphragm 2 is (1.8 to 2.5):1.

[0138] In this embodiment of the invention, the depth of the receiving structure 119 has an important impact on the shaping result. If it is too shallow, it cannot accommodate enough material of the metal diaphragm 2. If it is too deep, it is difficult for the metal diaphragm 2 to be fully "pressed" into the deepest part of the receiving structure 119, and the metal diaphragm 2 is easily "cut off" at the interval of the receiving structure 119.

[0139] Therefore, as one embodiment of the present invention, refer to Figure 8 The depth D of the receiving structure 119 (the depth of the recess relative to the plane where the sealing surface 11 is located) can be larger than the thickness of the metal diaphragm 2. For example, the ratio of depth D to thickness of metal diaphragm 2 is 1.8 to 2.5, and further can be 2 to 2.3, for example 2.2.

[0140] For example, if the thickness of the metal diaphragm 2 is 0.1 mm, the depth D of the accommodating structure 119 can be between 0.18 mm and 0.25 mm.

[0141] Optional, refer to Figure 6 The sealing surface 11 is an annular surface surrounding the pressure measuring area 12; and the receiving structure 119 includes multiple annular grooves surrounding the pressure measuring area 12.

[0142] As one embodiment of the present invention, refer to Figure 6 When the sealing surface 11 is an annular surface (such as a circular annular surface), the receiving structure 119 can be multiple "annular grooves (such as circular annular grooves)" surrounding the pressure measuring area 12. This type of receiving structure 119 is continuous along the length direction, which is convenient for processing and easy to achieve uniform distribution on the annular sealing surface 11.

[0143] Furthermore, refer to Figure 8 Multiple annular grooves can be closely adjacent, so that the metal diaphragm 2 at each position can enter the receiving structure 119.

[0144] It should be understood, with reference Figure 9 It is also feasible if there is a certain interval between adjacent annular grooves.

[0145] It should be understood that the receiving structure 119 in the embodiments of the present invention is not limited to the form of an "annular groove". For example, the receiving structure 119 may also be multiple "pits" or other forms such as spaced "multi-segment grooves", as long as it is recessed relative to the sealing surface 11 and allows the material of the metal diaphragm 2 to enter.

[0146] Optional, refer to Figure 8 , Figure 9 Each annular groove has an arc-shaped or trapezoidal cross-section.

[0147] As one embodiment of the present invention, refer to Figure 8 The cross-sectional shape of the above annular groove can be arc-shaped (i.e., the part obtained by dividing a circle by a straight line, with the corresponding central angle less than or equal to 180 degrees). Since all surfaces of the arc are smooth arcs, the material of the metal diaphragm 2 can be fully "pressed" into all positions of the annular groove, and there are no dead corners where the material cannot enter.

[0148] Or, refer to Figure 9 As another embodiment of the present invention, the cross-section of the annular groove can also be trapezoidal, specifically, the base (the longer side) of the trapezoid corresponds to the opening of the annular groove. Furthermore, the trapezoid can be an isosceles trapezoid, so that there are no dead corners in the trapezoid where materials cannot easily enter.

[0149] It should be understood that, in the embodiments of the present invention, the cross-section of the annular groove is not limited to the above-mentioned arc-shaped and trapezoidal forms. For example, the cross-section of the annular groove can also be a triangular, polygonal, elliptical, or other truncated shapes. Furthermore, the shape of the cross-section at different positions of the annular groove can be different.

[0150] Optional, refer to Figure 6 , Figure 8 Each annular groove has an arc-shaped cross-section; the distance between the centerlines of any two adjacent annular grooves is between 0.6 mm and 1.2 mm; the depth of the annular groove is between 0.18 mm and 0.25 mm; and the radius of the arc shape of the cross-section of the annular groove is between 0.4 mm and 0.6 mm.

[0151] As one embodiment of the present invention, refer to Figure 8 When the cross-section of the annular groove is arc-shaped, the depth of the annular groove (that is, the height of the arc) D can be 0.18mm to 0.25mm, and further can be 0.2mm to 0.23mm, for example, 0.22mm; the distance between the centerlines of adjacent annular grooves (that is, the width of the annular groove if the annular grooves are adjacent) S can be 0.6mm to 1.2mm, and further can be 0.7mm to 1.1mm, for example, 0.8mm; and the radius of the arc (that is, the radius of the circle in which the arc is located) R can be 0.4mm to 0.6mm, for example, 0.5mm.

[0152] Optionally, the ratio of the thickness of the flexible membrane 3 to the depth of the accommodating structure is (0.9 to 1.5):1.

[0153] In this embodiment of the invention, the thickness of the flexible membrane 3 also affects the shaping effect. If it is too thin, even if the flexible membrane 3 is deformed to the point of breaking, it will not be able to fully "press" the metal membrane 2 into the receiving structure 119. If it is too thick, the deformation will be basically absorbed by the flexible membrane 3 itself, and thus it will also be unable to fully "press" the metal membrane 2 into the receiving structure 119.

[0154] As one embodiment of the present invention, the thickness of the flexible membrane 3 may be comparable to or slightly greater than the depth D of the receiving structure 119. For example, the ratio of the thickness of the flexible membrane 3 to the depth D of the receiving structure 119 may be 0.9 to 1.5, and may be further 1.1 to 1.3, for example 1.2.

[0155] Optionally, the density of the flexible membrane 3 material is 950 kg / m³. 3 ~1500Kg / m 3 The material of the flexible membrane 3 has a Poisson's ratio of 0.35 to 0.45; the tensile strength of the material of the flexible membrane 3 is 150 MPa to 300 MPa; the elongation at break of the material of the flexible membrane 3 is 80% to 300%; and the elastic modulus of the material of the flexible membrane 3 is 700 MPa to 1000 MPa.

[0156] As one embodiment of the present invention, the material of the flexible membrane 3 should also meet certain mechanical properties in order to more fully and uniformly "press" the material of the metal membrane 2 into the receiving structure 119. For example, the density of the material of the flexible membrane 3 can be 950 kg / m³. 3 ~1500Kg / m 3 Further, it can reach 1000Kg / m 3 ~1400Kg / m 3 For example, 1200Kg / m 3 The tensile strength of the material can be between 150 MPa and 300 MPa, and further between 200 MPa and 250 MPa, for example, 230 MPa; the elongation at break of the material can be between 80% and 300%, and further between 120% and 260%, for example, 200%; the elastic modulus of the material can be between 700 MPa and 1000 MPa, and further between 800 MPa and 900 MPa, for example, 850 MPa.

[0157] It should be understood that the material of the flexible membrane 3 can also meet other parameter conditions; for example, the coefficient of thermal expansion of the material can be 1.23*10. -4 / ℃~3*10 -4 / ℃, further up to 1.5*10 -4 / ℃~2.6*10 -4 / ℃, for example, 2*10 -4 / ℃.

[0158] Optionally, the flexible membrane 3 may be made of at least one of polyethylene and polytetrafluoroethylene.

[0159] As one embodiment of the present invention, materials such as polyethylene (PE) and polytetrafluoroethylene (PTFE) meet the above requirements and can be used as materials for the flexible membrane 3.

[0160] It should be understood that the specific parameters and materials of the flexible membrane 3 used in the embodiments of the present invention are not limited to the examples above.

[0161] Optionally, bringing the sealing surface 11 and the shaping surface close to each other (S103) includes:

[0162] S1031, make the sealing surface 11 and the shaping surface 491 approach each other at a speed of 0.5mm / s to 10mm / s, until the pressure between the sealing surface 11 and the shaping surface 491 reaches 30MPa to 90MPa.

[0163] As one embodiment of the present invention, the pressing process of the sealing surface 11 and the shaping surface 491 can also meet certain parameter conditions to achieve a better shaping effect. For example, the approach speed of the sealing surface 11 and the shaping surface 491 (such as the pressing speed of the press head 52 of the press) can be 0.5 mm / s to 10 mm / s, and further can be 2 mm / s to 7 mm / s, for example, 5 mm / s; while the maximum pressure finally reached between the sealing surface 11 and the shaping surface 491 (that is, the shaping fixture 4 can be separated after reaching the maximum pressure) can be 30 MPa to 90 MPa (for a pressure testing flange product, the corresponding pressure can be 50 tons to 150 tons), and further can be 50 MPa to 70 MPa, for example, 60 MPa.

[0164] Optional, refer to Figure 14 The placement of the flexible membrane 3 between the metal membrane 2 and the shaping surface 491 (S102) includes:

[0165] S102A1, Set the shaping fixture 4 with the shaping surface 491 facing upward.

[0166] S102A2, The flexible membrane 3 is placed on the shaping surface 491.

[0167] S102A3. The pressure testing flange is placed on the flexible diaphragm 3 with the metal diaphragm 2 facing down, so that the sealing surface 11 corresponds to the shaping surface 491.

[0168] Optional, refer to Figure 14 Making the sealing surface 11 and the shaping surface 491 approach each other (S103) includes:

[0169] S103A1. Apply a downward force to the side of the pressure testing flange away from the metal diaphragm 2, so that the sealing surface 11 and the shaping surface 491 approach each other.

[0170] As one embodiment of the present invention, refer to Figure 14First, the shaping fixture 4 can be fixedly set (e.g., on the worktable 51 of the press), with the side having the shaping surface 491 (and the slot 492) facing upwards (relative to gravity, the same below); then, the flexible membrane 3 is set on the shaping surface 491 of the shaping fixture 4; then, the pressure measuring flange is set on the flexible membrane 3, with the side having the metal diaphragm 2 facing downwards, and the sealing surface 11 is located opposite to the shaping surface 491; then, downward pressure is applied to the upper side of the pressure measuring flange (the side of the flange seat 1 away from the sealing surface 11) (e.g., by pressing down through the press head 52 of the press), thereby achieving the "pressing" of the shaping surface 491 and the sealing surface 11.

[0171] It should be understood that the arrangement of the shaping fixture 4 and the pressure testing flange in the embodiments of the present invention, as well as the way in which the two are brought close together, are not limited to the examples above. For example, the pressure testing flange may be positioned below and the shaping fixture 4 above, or the pressure testing flange and the shaping fixture 4 may be positioned "horizontally" opposite each other.

[0172] Optional, refer to Figure 14 The shaping fixture 4 includes a first portion 41 and a second portion 42; the first portion 41 has a first mating surface, and a shaping surface 491 is located on the side of the first portion 41 opposite to the first mating surface; the second portion 42 has a second mating surface that matches the first mating surface; one of the first mating surface and the second mating surface is a convex spherical crown surface, and the other is a concave spherical crown surface; and, setting the shaping fixture 4 with the shaping surface 491 facing upward (S102A1) includes:

[0173] S102A11, Set the second part 42 with the second mating surface facing upwards.

[0174] S102A12, The first part 41 is placed on the second part 42 with the shaping surface 491 facing upward, so that the first mating surface and the second mating surface are mated.

[0175] As one embodiment of the present invention, refer to Figure 14 The shaping fixture 4 can be divided into two mutually mating parts (first part 41 and second part 42), and the mating surfaces between the two parts (first mating surface and second mating surface) are respectively the matching convex spherical crown surface and concave spherical crown surface.

[0176] The shaping surface 491 (and the slot 492) is located on one side of the first part 41. Therefore, when setting the shaping fixture 4, the second part 42 can be set first with its second mating surface facing upwards; then the first part 41 can be set with its first mating surface facing downwards to mate with the second mating surface. Thus, the shaping fixture 4 as a whole has the shaping surface 491 (and the slot 492) facing upwards. Correspondingly, the flexible membrane 3 and the pressure measuring flange can also be sequentially set on the first part 41.

[0177] The above-described shaping fixture 4 constitutes a "spherical floating fixture". Its two parts (the first part 41 and the second part 42) are in a smooth spherical fit, thus forming a "spherical floating pair". The two parts can slide relative to each other around the center of the spherical crown. Therefore, when the pressure-bearing surface of the pressure-measuring flange (such as the surface pressed by the pressure head 52 of the press) is not completely perpendicular to the pressure-applying surface (shaping surface 491), the relative sliding between the first part 41 and the second part 42 can make the shaping surface 491 completely parallel to the sealing surface 11, and the force direction is perpendicular to both of them, ensuring uniform force distribution.

[0178] Optional, refer to Figure 14 The ratio of the maximum outer diameter of the shaping surface 491 to the maximum outer diameter of the sealing surface 11 is (1.05~2)∶1; and the diameter of the convex spherical crown surface is 200mm~600mm.

[0179] As one embodiment of the present invention, refer to Figure 14 The dimensions of the shaping fixture 4 can also meet certain parameter conditions to achieve more flexible relative sliding. For example, the ratio of the maximum outer diameter d of the shaping surface 491 to the maximum outer diameter of the sealing surface 11 can be 1.05 to 2, and further can be 1.2 to 1.8, for example, 1.5; while the diameter r of the convex spherical crown surface (which is also the diameter of the concave spherical crown surface) can be 200mm to 600mm, and further can be 300mm to 400mm, for example, 500mm.

[0180] It should be understood that, although Figure 14 The example given is that the first mating surface is a convex spherical cap and the second mating surface is a concave spherical cap. However, it is also feasible if the first mating surface is a concave spherical cap and the second mating surface is a convex spherical cap, as long as the two can form a spherical floating pair.

[0181] It should be understood that the shaping fixture 4 in the embodiments of the present invention may not be in the form of the above "ball floating fixture", as long as it includes a shaping surface 491 that can mate with the sealing surface 11.

[0182] Secondly, referring to Figures 6 to 18 This invention provides a method for shaping a pressure-measuring flange metal diaphragm 2.

[0183] This invention provides a specific method for shaping the metal diaphragm 2 of a pressure measuring flange.

[0184] Reference Figure 14 , Figure 18 The method for shaping the pressure-measuring flange metal diaphragm 2 according to an embodiment of the present invention includes:

[0185] S201, provides pressure testing flange, flexible diaphragm 3, and shaping fixture 4.

[0186] The pressure testing flange includes a flange seat 1 and a metal diaphragm 2. The flange seat 1 has a sealing surface 11, on which a recessed receiving structure 119 is formed. The metal diaphragm 2 is located outside the sealing surface 11.

[0187] Among them, the flexible membrane 3 is made of flexible material.

[0188] The shaping fixture 4 has a shaping surface 491 that matches the sealing surface 11. The shaping fixture 4 includes a first part 41 and a second part 42. The first part 41 has a first mating surface. The shaping surface 491 is located on the side of the first part 41 away from the first mating surface. The second part 42 has a second mating surface that matches the first mating surface. One of the first mating surface and the second mating surface is a convex spherical crown surface, and the other is a concave spherical crown surface.

[0189] S202, Set the second part 42 with the second mating surface facing upwards.

[0190] S203. The first part 41 is placed on the second part 42 with the shaping surface 491 facing upward, so that the first mating surface and the second mating surface are mated.

[0191] S204. Place the flexible membrane 3 on the shaping surface 491.

[0192] S205. The pressure testing flange is placed on the flexible diaphragm 3 with the metal diaphragm 2 facing down, so that the sealing surface 11 corresponds to the shaping surface 491.

[0193] S206. Apply a downward force to the side of the pressure testing flange away from the metal diaphragm 2, so that the sealing surface 11 and the shaping surface 491 approach each other, so as to apply a force to the metal diaphragm 2 pointing towards the sealing surface 11, causing the metal diaphragm 2 to undergo plastic deformation and partially enter the receiving structure 119.

[0194] Optionally, the metal diaphragm 2 is a tantalum diaphragm; the flexible diaphragm 3 is made of polyethylene; the sealing surface 11 is an annular surface surrounding the pressure measuring area 12; and the tantalum diaphragm is connected to the outer edge of the pressure measuring area 12 by roll resistance welding, and the tantalum diaphragm is connected to the outer edge of the sealing surface 11 by tungsten inert gas welding.

[0195] Thirdly, referring to Figures 6 to 17 This invention provides a pressure testing flange.

[0196] This invention provides a pressure testing flange product obtained after the above shaping method.

[0197] Reference Figure 13 The pressure testing flange provided in this embodiment of the invention includes:

[0198] A flange seat 1 having a sealing surface 11, on which a recessed receiving structure 119 is formed; and

[0199] The metal diaphragm 2 is located outside the sealing surface 11, and part of the material of the metal diaphragm 2 enters the receiving structure 119 through plastic deformation.

[0200] Optionally, the metal diaphragm 2 is a tantalum diaphragm; the sealing surface 11 is an annular surface surrounding the pressure measuring area 12; and the tantalum diaphragm is connected to the outer edge of the pressure measuring area 12 by roll resistance welding, and the tantalum diaphragm is connected to the outer edge of the sealing surface 11 by tungsten inert gas welding.

[0201] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A method for shaping a metal diaphragm of a pressure-measuring flange, characterized in that, include: A pressure testing flange, a flexible diaphragm, and a shaping fixture are provided. The pressure testing flange includes a flange seat and a metal diaphragm. The flange seat has a sealing surface with a recessed receiving structure formed on the sealing surface. The metal diaphragm is located outside the sealing surface. The flexible diaphragm is made of a flexible material. The shaping fixture has a shaping surface that matches the sealing surface. The flexible membrane is disposed between the metal diaphragm and the shaping surface; as well as The sealing surface and the shaping surface are brought close together to apply a force to the metal diaphragm pointing towards the sealing surface, causing the metal diaphragm to undergo plastic deformation and partially enter the receiving structure.

2. The method according to claim 1, characterized in that, The ratio of the depth of the accommodating structure to the thickness of the metal diaphragm is (1.8 to 2.5):

1.

3. The method according to claim 1, characterized in that, The sealing surface is an annular surface surrounding the pressure measuring area; and The accommodating structure includes multiple annular grooves arranged around the pressure measuring area.

4. The method according to claim 3, characterized in that, The cross-section of each of the aforementioned annular grooves is either arc-shaped or trapezoidal.

5. The method according to claim 3, characterized in that, The cross-section of each of the aforementioned annular grooves is arc-shaped; The distance between the centerlines of any two adjacent annular grooves is between 0.6 mm and 1.2 mm; The depth of the annular groove is between 0.18 mm and 0.25 mm; and The radius of the arc shape of the cross-section of the annular groove is between 0.4 mm and 0.6 mm.

6. The method according to claim 1, characterized in that, The ratio of the thickness of the flexible membrane to the depth of the accommodating structure is (0.9 to 1.5):

1.

7. The method according to claim 1, characterized in that, The density of the flexible membrane material is 950 kg / m³. 3 ~1500Kg / m 3 ; The material of the flexible membrane has a Poisson's ratio of 0.35 to 0.45; The tensile strength of the flexible membrane material is between 150 MPa and 300 MPa. The elongation at break of the flexible membrane material is between 80% and 300%; and The elastic modulus of the material of the flexible membrane is between 700 MPa and 1000 MPa.

8. The method according to claim 1, characterized in that, The flexible membrane is made of at least one of polyethylene and polytetrafluoroethylene.

9. The method according to claim 1, characterized in that, The step of bringing the sealing surface and the shaping surface closer together includes: The sealing surface and the shaping surface are brought close to each other at a speed of 0.5 mm / s to 10 mm / s until the pressure between the sealing surface and the shaping surface reaches 30 MPa to 90 MPa.

10. The method according to claim 1, characterized in that, The step of placing the flexible membrane between the metal diaphragm and the shaping surface includes: setting the shaping fixture with the shaping surface facing upwards; placing the flexible membrane on the shaping surface; placing the pressure measuring flange on the flexible membrane with the metal diaphragm facing downwards, so that the sealing surface corresponds to the shaping surface; and The step of bringing the sealing surface and the shaping surface closer together includes applying a downward force to the side of the pressure measuring flange away from the metal diaphragm, so that the sealing surface and the shaping surface approach each other.

11. The method according to claim 10, characterized in that, The shaping fixture includes a first part and a second part; the first part has a first mating surface, and the shaping surface is located on the side of the first part opposite to the first mating surface; the second part has a second mating surface that matches the first mating surface; one of the first mating surface and the second mating surface is a convex spherical crown surface, and the other is a concave spherical crown surface; as well as The step of setting the shaping fixture with the shaping surface facing upward includes: setting the second part with the second mating surface facing upward; The first part is placed on the second part with the shaped surface facing upwards, so that the first mating surface and the second mating surface mate.

12. The method according to claim 11, characterized in that, The ratio of the maximum outer diameter of the shaping surface to the maximum outer diameter of the sealing surface is (1.05~2)∶1; and The diameter of the convex spherical crown is between 200 mm and 600 mm.

13. The method according to claim 1, characterized in that, The metal diaphragm is a tantalum diaphragm.

14. The method according to claim 1, characterized in that, The sealing surface is an annular surface surrounding the pressure testing area; the pressure testing flange includes: Flange seats are available; The metal diaphragm is disposed outside the sealing surface; The metal diaphragm is welded to the outer edge of the pressure measuring area using a first welding process; and The metal diaphragm is welded to the outer edge of the sealing surface using a second welding process.

15. The method according to claim 14, characterized in that, The first welding process is roll resistance welding; and The second welding process is tungsten inert gas welding.

16. The method according to claim 14, characterized in that, Between providing the flange seat and disposing the metal diaphragm outside the sealing surface, the method further includes: The receiving structure is formed by machining on the sealing surface.

17. A method for shaping a metal diaphragm of a pressure-measuring flange, characterized in that, include: A pressure-testing flange, a flexible diaphragm, and a shaping fixture are provided. The pressure-testing flange includes a flange seat and a metal diaphragm. The flange seat has a sealing surface with a recessed receiving structure formed on the sealing surface. The metal diaphragm is located outside the sealing surface. The flexible diaphragm is made of a flexible material. The shaping fixture has a shaping surface that matches the sealing surface. The shaping fixture includes a first part and a second part. The first part has a first mating surface, and the shaping surface is located on the side of the first part opposite to the first mating surface. The second part has a second mating surface that matches the first mating surface. One of the first mating surface and the second mating surface is a convex spherical crown surface, and the other is a concave spherical crown surface. The second part is positioned with the second mating surface facing upwards; The first part is disposed on the second part with the shaping surface facing upward, so that the first mating surface and the second mating surface mate; The flexible membrane is disposed on the shaping surface; The pressure measuring flange is positioned on the flexible membrane with the metal diaphragm facing downwards, so that the sealing surface corresponds to the shaping surface; as well as A downward force is applied to the side of the pressure measuring flange away from the metal diaphragm, so that the sealing surface and the shaping surface approach each other, thereby applying a force to the metal diaphragm pointing towards the sealing surface, causing the metal diaphragm to undergo plastic deformation and partially enter the receiving structure.

18. The method according to claim 17, characterized in that, The metal diaphragm is a tantalum diaphragm; The flexible membrane is made of polyethylene; The sealing surface is an annular surface surrounding the pressure measuring area; and The tantalum diaphragm is connected to the outer edge of the pressure measuring area by roll resistance welding, and the tantalum diaphragm is connected to the outer edge of the sealing surface by tungsten inert gas welding.

19. A pressure-measuring flange, characterized in that, include: A flange seat having a sealing surface, wherein a recessed receiving structure is formed on the sealing surface; as well as, A metal diaphragm is disposed outside the sealing surface, and part of the material of the metal diaphragm enters the receiving structure through plastic deformation.

20. The pressure-measuring flange according to claim 19, characterized in that, The metal diaphragm is a tantalum diaphragm; The sealing surface is an annular surface surrounding the pressure measuring area; and The tantalum diaphragm is connected to the outer edge of the pressure measuring area by roll resistance welding, and the tantalum diaphragm is connected to the outer edge of the sealing surface by tungsten inert gas welding.

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